<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .c1{
            height: 300px;
            width: 300px;
            /*边框颜色*/
            /*border-color: red;*/
            /*边框线条属性 实线*/
            /*border-style: solid;*/
            /*边框的宽度*/
            /*border-width: 1px;*/

            /*简写*/
            border: gray dashed 10px;
            /*右边的边框去除*/
            border-right: none;
        }
    </style>
</head>
<body>

<div class="c1"></div>

</body>
</html>
